My cousin says he doesn't post online anymore, but he'd email with you about his efforts to prove or disprove this. I believe both he and the other cousin who has done a lot of research in this area are only willing to say for sure that William and Mary/Polly were the parents of our George.
We all think that William was a Rev Soldier, and that Lucy was their daughter (and that there were probably more children), but so far, no one has turned up verifiable proof.
If you'd like to hear from my cousin Gary, please send me your eaddress. You can find mine by clicking on my name. On the other hand, I'm sure we'll all understand if you'd rather not.